I was more thinking of roughly hubble-sized telescopes, but as a program optimized for having several telescopes. Like spending 1 billion in total for a larger amount of telescopes, which can be easily replaced should one fail or new instruments are required.
> Also, if there is one basic platform, sending different telescopes with quite different sensor packages would be an option.
Satellites are usually designed around an integrator's platform, called "bus". https://en.wikipedia.org/wiki/Satellite_bus